Decorative stone

A revetment useful in preventing soil erosion, having a plurality of stones, each stone comprising at least two parallel rib members spaced from each other, at least two parallel crosspiece members spaced from each other extending transversely to said rib members and interconnecting at least the respective ends thereof, said rib members including end portions projecting beyond said crosspiece members at the point of connection therewith, said crosspiece members including end portions projecting beyond said rib members at the point of connection therewith, end surfaces on said end portions of said ribs and crossbars being formed with substantially corresponding projections and recesses alternating with each other on all sides of said stone and also from each side to the adjacent side so that said end portions on each side of said stone may be joined to end portions on any side of an adjacent stone, and at least one extension portion provided on said rib members and said crosspiece members disposed between the projecting end portions of said crosspiece members and between the projecting end portions of said rib members, said extension portions being shorter than said end portions so as not to interfere with the joining of the end portions of one stone with those on another stone, whereby undermining of the hollow space defined between adjacent stones is prevented.

A revetment useful in preventing soil erosion, having a plurality of stones, each stone comprising:

• a pair of parallel rib members spaced from each other, a pair of parallel crosspiece members spaced from each other and extending transversely to said rib members and interconnecting the respective ends thereof such that said parallel crosspiece members define at least one opening therebetween, said pair of rib members including end portions projecting beyond said crosspiece members including end portions projecting beyond said rib members at the point of connection therewith, said projecting end portions of said rib members and said crosspiece members alternately having end surfaces formed with projections and recesses, said projections and recesses alternating on each side and from each side to its adjacent sides so that any side of the stone may be interengaged with any side of a further stone and being arranged such that, when the stone is arranged with further stones, a hollow space is defined between adjacent stones, with at least one extension portion extending into the hollow space provided on said rib members and said crosspiece members disposed between the projecting end portions of said crosspiece members and between the projecting end portions of said rib members to prevent an undermining of the hollow space defined between adjacent stones.